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G. KRICHEVSKI 83 A EDMONDS. ESOAPEMENT FOR WATCHES.

No. 321,611. Patented July 7, 188-5..

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G. KRICHEVSKI & A. EDMONDS. ESGAPEMENT FOR WATCHES.

No. 321,611. Patented July 7, 1885.

WITNESSEgE "i MENTOR:

ATTORNEYS.

UNITED STATES ATENT nines.

GERSON KRIOHEVSKI AND ABRAHAM EDMONDS, OF NEV YORK, N. Y.

ESCAPEMENT FOR WATCHES.

SPECIFICATION forming part. of Letters Patent No. 321,611, dated .i'uly7,1885.

Application filed January 19, 1885.

To aZZ whom it may concern.-

Be it known that we, GERsoN KRIOHEVSKI and ABRAHAM EDMoNDs, both of thecity, county, and State of New York, have invented certain new anduseful Improvements in Escapements for WVatches, of which the followingis a full, clear, and eXact description.

The object of our invention is to reduce the friction and increase thedurability of the esoapementmovement of watches; and our inventionconsists, principally, of acurved or circular detent or lockin g piecefor the escapement-wheel.

The invention also consists in giving said detent or looking piece acircular movement for releasing the teeth of the escapementwheel.

The invention consists, also, of the means employed for rotating theeseapement-detent, and of the construction, arrangement, and combinationof parts, all as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 shows our new eseapement-movement, the parts thereof being inthe position they occupy when the escapement -wheel is held by thelocking-piece or eseapement-detent, the latter shown in section on lineas 00 of Fig. 5. Fig. 2 shows the same, the parts be ing in the positionthey occupy just as a tooth of the escapementwheel is released by thedetent or locking piece. Fig. 3 shows the same after the tooth haspassed the detent, showing a tooth of the escapement in engagement withthe impulse-pallet to the balance-wheel. Fig. 4c shows the same, theparts being in the position they occupy at the time thedisengaging-pallet passes the pawl or spring upon the escapement-leverduring the return movement of the balance-wheel, and Fig. 5 is anenlarged edge view of the movement, showing the hair-spring and part ofthe balancewheel. Fig. 6 is a detail view.

A represents the lower plate, and the balance-wheel, of thewatch-movement, and 0 represents the escapement-wheel. 7c is the staffon which the balance-wheel B is secured,

(No model.)

and on the staff It is secured the hair-spring w. (Shown in Fig.5.) Thestaff is provided with the disk-roller Z, which is formed with thedisengaging-pallet m, to act in connection with the escapement-lever eand spring n, as hereinafter described, to vibrate the lever 12. Thestaff is is also provided with the larger diskroller q, formed with theimpulse-pallet that intercepts the teeth of the escapenient-wheel O, andcauses the wheel to impart new power to the balance-wheel.

a is the escapeinent-detent orlocking-piece, pivoted on its axis Z), andmade practically semi-cylindrical or meniscus-shaped in crossseetion atthe point where the teeth of the escapement-wheel come in contact withit. It is formed to present the curved horn or surface a as the point ofcontact with the teeth of the escapementwheel.

The detent a is rotary reciprocated on its axis by the vibrations of thelever e acting through the disk or arm 0, secured to the detent, and thepin 0, secured to the disk and entering the slot f made in the lever e.The

slot f and pin 0 may be reversed, if desired.

The lever c is pivoted at 6 is held pressed constantly toward theescapement-wheel by the spring h, the free end of which presses againstpin 9, secured to the lever, and the said lever is provided with theabove-mentioned spring a, that reaches past the free end of the lever,so as to stand normally in the path of the disengaging-pallet m, asshown clearly in the drawings.

The action of our eseapementmovement is as follows: The escapementwheelbeing held by the detent a, and the balance-wheel B swinging in thedirection of the small arrows, (shown in the drawings, thedisengaging-pallet m on the fixed disk Zwill strike the end of thedelicate spring a and carry the lever e to the dotted line marked 6 inFigs. 1 and 3. In moving to this position the lever a will turn theholding piece or detent a and bring the curved portion a thereof from infront of the 9 tooth of the eseapeinent-wheel O and let the tooth pass.At the same time that the tooth passes the detent a theimpulse-pallet p,fixed to the roller-disk q, is carried to the dotted line marked r inFig. 1, and the instant the tooth of the eseapenient wheel leaves thecurved dctent a the tooth of the escapeinentwheel nearest the linemarked 0' will strike the pallet 11 and throw the balance-wheel B, andstaff It, and disks 9 Z, and pallets m p partly around the circle, ornearly a whole revolution. The instant the pallet m leaves the end ofthe spring on the lever e is forced back by the spring h to its orignalposition, that shown in full lines in Figs. 1 and 3, which movement ofthe lever a will turn the locking-pallet a in position to intercept thenext tooth of the escapenient-wheel. O. The hairspring a; will nowreturn the balance-wheel, staff 70, disks Z q, and pallets p m, thespring n yielding to permit the pallet m to pass beyond it and past thelever 02 ready for another vibration.

A pin, 8, is fixed in the plate A of the watchmovement to prevent thelever n and detent a from being moved too far, and a pin, 8, is fixed inthe plate A below the disk q to prevent vibration of the lever c.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. The detent a, connected with the lever c byan arm or disk, 0, and pin 0, entering a slot in the lever,substantially as described.

2. The semicircular detent a, formed or provided with an arm or plate,0, substantially as shown and described.

GERSON KRICHEVSKI. ABRAHAM EDMONDS. XVitnesses:

H. A. \Vnsr, O. SEDGWICK.

